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How calcium prevents precipitation hardening in Al–Mg–Si alloys

How calcium prevents precipitation hardening in Al–Mg–Si alloys

Kategori
Vitenskapelig artikkel
Sammendrag
We have investigated the effect on precipitate microstructure and hardness upon adding small amounts of Ca to a base Al–Mg–Si alloy. The main investigative techniques were transmission and scanning electron microscopy. We found that large Ca-containing particles with composition CaAl2Si2 form during the production stages of the alloy. The particles leave less Si available in solid solution for the nucleation of hardening precipitates, leading to a coarser microstructure consisting of less coherent precipitates. The resulting hardness decrease is measurable for alloys containing more than 60 at ppm of Ca.
Oppdragsgiver
  • NORTEM / 197405
  • Research Council of Norway (RCN) / 193619
Språk
Engelsk
Institusjon(er)
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Industri / Materialer og nanoteknologi
År
Publisert i
Materials Science & Engineering: A
ISSN
0921-5093
Forlag
Elsevier
Årgang
575
Side(r)
241 - 247